diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 40947f5bc6c5..15ce5ec3edb2 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2330,9 +2330,9 @@ size_t iommu_unmap_fast(struct iommu_domain *domain,
 }
 EXPORT_SYMBOL_GPL(iommu_unmap_fast);
 
-size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
-		    struct scatterlist *sg, unsigned int nents, int prot,
-		    gfp_t gfp)
+static size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+			     struct scatterlist *sg, unsigned int nents, int prot,
+			     gfp_t gfp)
 {
 	size_t len = 0, mapped = 0;
 	phys_addr_t start;